Site redesign. Initial commit:

* Bootstrap has been replaced with Zurb Foundation 5
  See http://foundation.zurb.com/docs/ for references.
  For now the full Foundation has been included, later on we will
  customize with only required components.
* Remove <noscript> from layout files as we expect JavaScript support
* Add new design assets and logo
Reduce background image size
Update index page to match the styles.
The Mailchimp form shall be accessed by clicking "Subscribe" button.
Update headings
Style sponsorship page
Style up the 2013 munich page
Updat organizers heading
Update year of the event on the main page
Remove margin-top from h2 on main page
Merge pull request #8 from assimovt/master

Initial site design